Abstract
Molecular J-aggregates have attracted much attention because of ultrafast and large optical nonlinearity caused by excitonic resonance. Especially porphyrin (-aggregates are materials of great interest since they are model substances for the light-harvesting mechanism in a system of antenna chlorophyll. The one-dimensional porphyrin J-aggregates show sharp absorption peaks at 2.53 eV (S2-state: Bx-band) and 1.75 eV (S1-state: Qx-band) composing three-level Frenkel exciton system, which is depicted in Figure 1(a).
© 1999 Optical Society of America
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